JPH10163027A - Inductance element and electronic circuit using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the adjustment accuracy by forming a printed pattern and magnetic body independently on the same plane and eliminating the magnetic body successively, varying the inductance of the printed pattern in the decreasing direction. SOLUTION: Near a printed pattern 101 a magnetic member 102 is independently adhered to face it. Part 103 of the magnetic member 102 near the pattern 101 is cut off of adjust the inductance of the printed pattern 101, which has a linear shape, this reducing the stray capacitances at both ends, and keeping it inductive up to a high frequency range. A magnetic member is adhered to the entire inside of an opening of the printed pattern independently near A U-shaped printed pattern and partly cut thereafter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductance used for a filter circuit such as a tuner for television reception, a tuner for satellite broadcast reception (hereinafter referred to as a BS tuner), an RF front end for communication, a tuning circuit, a matching circuit and the like. The present invention relates to an element and an electronic circuit using the same.

[0002]

2. Description of the Related Art This inductance element has approximately 50
The prior art will be described below with reference to the drawings, using a BS tuner used in a frequency band of 0 MHz or more and using a frequency band of 1 GHz or more as a representative example.

FIG. 13 is a block diagram from the input to the mixer of a general BS tuner. In FIG. 13, an input signal input from an input terminal 1301 is supplied to an input filter circuit 1302, an amplifier circuit 1303, an interstage filter circuit 13
04 and input to one of the mixer circuits 1305, and the output of the oscillator circuit 1306 is
05 has been input. The output of the mixer circuit 1305 is output from an IF output terminal 1307.

FIG. 10 shows an input filter circuit 13 shown in FIG.
02 shows a typical circuit diagram. In FIG. 10, reference numeral 1001 denotes an input terminal. Capacitor 1006
And a printed pattern 1009, a capacitor 1007 and a printed pattern 1010, and a capacitor 1008 and a printed pattern 1011 form a series resonance circuit.
, 1003, 1004, and 1005 to form a high-pass filter. Here, the capacitance value of the capacitor from 1006 to 1008 or 1009
If there is a variation in the inductance values of the printed patterns from No. to 1011, the return loss, insertion loss, and attenuation are deteriorated, leading to deterioration in the performance of the receiver. To correct this, the print pattern 1009
And exposed copper foil portions 1012 and 1013 formed on each of 1010 and 1011 without the resist
And 1014 are formed, and any or all of these are soldered to form printed patterns 1009 to 101
1 is adjusted.

Here, each constant of the circuit will be described.
The capacitance values of the capacitors 1002 to 1008 are approximately 0 to 20 pF, and the inductance values of the printed patterns 1009 to 1011 are approximately 0 to 10 nH.

FIG. 11 shows an inter-stage filter circuit 13 shown in FIG.
FIG. 4 shows a typical circuit diagram of FIG. In FIG. 11, the print pattern 1108 and the capacitor 110
2, print pattern 1109 and capacitor 1104,
The print pattern 1110 and the capacitor 1106 form parallel resonance circuits, respectively, which are connected in series. In addition, both ends of the parallel resonance circuit are connected to the ground by capacitors 1101, 1103, 1105, and 1107 to form a low-pass filter. At this time,
Variations in the capacitance values of capacitors 1102, 1104, and 1106, or printed patterns 1108 and 1109
If there is a variation in the inductance value between the values 11 and 11, the return loss, the insertion loss, and the amount of attenuation become worse, which leads to the deterioration of the performance of the receiver. To compensate for this,
Print patterns 1108 and 1109 and 111
0, and exposing the copper foil exposed portions 1111, 1112, and 1113 except for the resist provided thereon, and soldering any or all of them to reduce the inductance value of each of the printed patterns 1108 to 1110. adjust.

Here, each constant of the circuit will be described.
The capacitance values of the capacitors 1101 to 1107 are approximately 0 to 10 pF, and the inductance values of the printed patterns 1108 to 1110 are approximately 0 to 10 nH.

FIG. 12 shows the oscillator circuit 130 of FIG.
6 is a representative circuit diagram. In FIG. 12, a DC voltage applied to a power supply terminal 1210 is
Oscillation transistor 1212 by 07 and 1209
And the resistor 1215 determines the emitter current. The transistor 12
The collector 12 is grounded at a high frequency by a capacitor 1211. The emitter is grounded at a high frequency by a small-capacitance capacitor 1214, and a positive feedback capacitor 1213 is connected between the emitter and the base to form a common collector Colpitts oscillation circuit. Further, a printed pattern 1201 is connected to the base of the transistor 1212 via a coarse coupling capacitor 1208 and the ground. A series body in which the cathode side of the varicap diode 1204 is connected to the capacitor 1203 is connected in parallel to the print pattern 1201. Then, the tuning power supply terminal 1206
Is applied to the cathode of the varicap diode 1204 via a resistor 1205. The capacitance value of the varicap diode 1204 is determined by the tuning voltage, and the oscillation frequency can be varied.

In the oscillation circuit having the above configuration,
The printed pattern 120 determining the oscillation frequency
1, the capacitor 1203, the varicap diode 1204, and the capacitor 1203.
If the capacitance value of the transistor 1212 connected via the resistor 8 varies, the oscillation frequency does not match within the predetermined tuning voltage range, and in the worst case, the channel cannot be selected. In order to correct this, a copper foil exposed portion 1202 formed by removing the resist is formed on the print pattern 1201 and soldered on the copper foil exposed portion 1202 to adjust the inductance value of the print pattern 1201.

Here, the circuit constants will be described. The inductance value of the printed pattern 1201 is approximately 0
To 10 nH.

FIG. 15 shows the shape of a microstrip line print pattern. In FIG. 15, for example, a ground pattern 1502 is provided on one surface of a printed circuit board 1501 having a dielectric constant of 4.4 and a thickness of 1.164 mm, and a straight line having a width W of 0.4 mm and a length L of 7.7 mm is provided on the other side. When the upper print pattern 1503 is provided, the inductance value of the print pattern 1503 becomes about 5 nH.
In other words, a microstrip line print pattern having an inductance value of about 5 nH, which is a commonly used value, can have a very small size such as a length L of 7.7 mm and a width W of 0.4 mm. It turns out that serving is difficult.

FIG. 9 shows a technique of an inductance element according to a conventional example. The print pattern 901 of FIG.
Are the print patterns 1009 to 1011 in FIG.
The print patterns 1108 to 1110 in FIG.
2 corresponds to the print pattern 1201.

In FIG. 9A, a print pattern 9 is shown.
A plan view before adjustment of an inductance element in which a copper foil exposed portion 902 is formed by excluding a resist on No. 01 is shown. FIG.
FIG. 3B is a plan view showing a state after the solder 903 is attached to the copper foil exposed portion 902 to adjust the inductance value of the printed pattern 901 so as to decrease the inductance value. However,
The amount of solder is difficult to control, and the inductance value greatly changes depending on the amount of solder, so that the accuracy of adjustment is poor. In terms of quality, there are problems such as solder balls, solder shorts, and burning due to a soldering iron.

FIG. 14 shows an attenuation characteristic with respect to an input frequency in FIG. 10 which is an input filter circuit of the BS tuner, and shows a solid line after adjustment by soldering any or all of the copper foil exposed portions 1012 to 1014. And the dotted line before adjustment. In FIG.
The state after the adjustment is the input signal CH of the BS tuner.
1 to minimize the loss in the receiving channel of CH15,
In addition, this is a case where the amount of attenuation is maximized so as to suppress the disturbance due to the UHF input signal.

As described above, in the conventional example, a method of reducing the inductance value of the printed pattern by soldering on the exposed portion of the copper foil on the printed pattern has been described.
As disclosed in Japanese Patent Publication No. 290005, an air-core coil provided close to a printed pattern is brought close to the printed pattern to adjust the inductance.

[0016]

However, in such a conventional configuration, when the inductance value of the printed pattern is large, the inductance value can be adjusted by applying solder on the printed pattern, but the amount of solder is controlled. In addition, there is a problem that the accuracy of adjustment is poor because the amount of solder varies greatly depending on the amount of solder.

An object of the present invention is to solve such a problem and to provide an inductance element with good adjustment accuracy.

[0018]

In order to achieve this object, an inductance element according to the present invention comprises a printed pattern laid on a surface of a printed circuit board and a magnetic body provided near the printed pattern. The print pattern and the magnetic material are independently formed on the same plane, and the magnetic material is sequentially deleted, so that the inductance of the print pattern is reduced. Thereby, the accuracy of the adjustment can be improved.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises a print pattern laid on a surface of a printed circuit board, and a magnetic material provided near the print pattern. And the magnetic body are independently formed on the same plane, and the magnetic body is sequentially deleted, thereby changing the inductance of the print pattern in a direction to decrease the inductance element. Thus, the inductance of the printed pattern is variable, so that the accuracy of the adjustment can be improved. Also, since no solder is attached to the printed pattern, there is no occurrence of solder balls, solder shorts, and the like. Furthermore, there is no solder burning due to a soldering iron. Furthermore, since there is no movable element, good performance against vibration can be obtained.

According to a second aspect of the present invention, there is provided the inductance element according to the first aspect, wherein the printed pattern is formed by a microstrip line. Since the microstrip line is used, the characteristic impedance becomes constant. Performance in the waveband is improved.

According to a third aspect of the present invention, there is provided the inductance element according to the first or second aspect, wherein the printed pattern is provided in a U-shape and a magnetic material is provided over the entire opening of the printed pattern. Since the print pattern is formed in a U-shape, the size can be reduced, the degree of coupling between the print pattern and the magnetic material increases, and the change range (adjustment range) of the inductance can be increased.

According to a fourth aspect of the present invention, the print pattern is provided in a U-shape, and a magnetic body is provided at least one of the inside and the outside of the print pattern in parallel with the print pattern. In the inductance element according to the second aspect, since the change in the inductance of the printed pattern is substantially proportional to the distance to be deleted, it is possible to accurately adjust the inductance value so as to decrease the inductance value. In addition, since the print pattern has a U-shape, the size can be reduced.

According to a fifth aspect of the present invention, there is provided the inductance element according to the first or second aspect, wherein a plurality of magnetic bodies having substantially the same shape are discretely arranged, and the magnetic bodies are deleted by a drill or the like. By doing so, the inductance can be adjusted stepwise, which is effective for automatic adjustment and the like.

According to a sixth aspect of the present invention, there is provided the inductance element according to the first or second aspect, wherein a plurality of magnetic bodies having an area ratio substantially logarithmically arranged are discretely arranged. The adjustment can be performed step by step, and the fine adjustment can be performed. It is also effective for automatic adjustment and the like.

According to a seventh aspect of the present invention, there is provided an electronic circuit comprising the series connection of a capacitor and an inductance element, wherein the inductance element is the inductance element according to any one of the first to sixth aspects. An accurate series resonance circuit can be obtained.

According to an eighth aspect of the present invention, a plurality of series-connected bodies of a capacitor and an inductance element are provided between an input terminal and an output terminal, and the inductance element is any one of the first to sixth aspects. Connect the one end of the series-connected body to the ground and the inductance element according to the description,
It is an electronic circuit with the other ends connected in series via a connection capacitor, and a high-pass filter with good adjustment accuracy can be obtained.
When used in an input circuit of a high-frequency device, an input circuit with small return loss and insertion loss can be realized.

According to a ninth aspect of the present invention, in the parallel connection of a capacitor and an inductance element, the inductance element is an electronic circuit as the inductance element according to any one of the first to sixth aspects. An accurate parallel resonance circuit can be obtained.

According to a tenth aspect of the present invention, a plurality of parallel connected bodies of a capacitor and an inductance element are provided in series between an input terminal and an output terminal, and the inductance element is any one of the first to sixth aspects. And an electronic circuit in which capacitors are connected between both ends of the parallel connection body and the ground, respectively, and a low-pass filter with good adjustment accuracy is obtained. Thus, an input circuit having a small return loss and insertion loss can be realized.

According to an eleventh aspect of the present invention, in the oscillation circuit including a resonance circuit in which a capacitor and an inductance element are connected in parallel, the capacitor is a varicap diode and the inductance element is one of the first to sixth aspects. The electronic circuit as the inductance element described in any one of the above, and the adjustment accuracy is good, so that the oscillation frequency can be adjusted within the determined varicap diode voltage range. Therefore, when used for the oscillator of the receiving device, the tuning performance is improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 shows a technique for adjusting the inductance of the print pattern 101 by removing a part of the magnetic body 102 near the print pattern 101 by cutting. In FIG. 1A, a magnetic body 1 that is opposed to the vicinity of a print pattern 101 and is independently attached is shown.
02 shows a state before adjustment in which 02 is arranged. FIG. 1 (b)
5 shows the state after adjustment by cutting a part 103 of the magnetic body 102. When the magnetic body 102 is cut, the inductance value of the printed pattern 101 decreases.
Note that the printed pattern 101 has a linear shape, so that the stray capacitance at both ends is small, and the printed pattern 101 can have inductance up to a high frequency range, and thus has excellent characteristics at higher frequencies.

Further, when a magnetic material is cut as a configuration of a microstrip line having a ground pattern on the back surface, the characteristic impedance of the microstrip line hardly changes, so that a circuit having excellent matching characteristics can be provided.

(Embodiment 2) FIG. 2 shows a technique for adjusting the inductance of the print pattern 201 by cutting a part 203 of a magnetic body 202 near a print pattern 201 having a U-shape. In FIG. 2A,
This figure shows a state before adjustment in which a magnetic body 202 attached to the entire inside of the opening of the print pattern 201 is arranged near the U-shaped print pattern 201 and independently. FIG. 2B shows a state after adjustment by cutting a part 203 of the magnetic body 202, and the inductance value of the printed pattern 201 decreases as the magnetic body 202 is cut. At this time, the print pattern 201 is formed in a U-shape,
Since the magnetic body 202 is attached to the entire inside of the opening, the magnetic flux generated by the print pattern 201 passes through the magnetic body 202 more. Therefore, as a result, the amount of adjustment of the inductance value of the printed pattern 201 by cutting the part 203 of the magnetic body 202 can be made larger than in the case of FIG.

(Embodiment 3) FIG. 3 shows a print pattern 301 and a magnetic material 302 having a U-shape, and a magnetic material 3 provided near the inside of the print pattern 301.
A technique for adjusting the inductance of the print pattern 301 by cutting a part of the print pattern 301 will be described. In FIG. 3A, a “U” -shaped print pattern 301 laid on a printed circuit board and a “U” -shaped magnetic body made of ferrite or the like inside the opening of the print pattern 301 are shown. The figure shows a state before adjustment in which an arrangement 302 is provided independently of the print pattern 301 and the opening of the magnetic body 302 is arranged in the same direction as the direction of the opening of the print pattern 301. FIG. 3B shows a state after adjustment by cutting a part 303 of the magnetic body 302. The printed pattern 3 is obtained by cutting the magnetic body 302.
The inductance value of 01 decreases. At this time, both the print pattern 301 and the magnetic material 302
And the opening of the magnetic body 302 is arranged in the same direction as the direction of the opening of the print pattern 301, so that the end of the U-shaped magnetic body 302 As the cutting is performed sequentially, the change in the inductance of the print pattern 301 is substantially proportional to the distance from the end face of the magnetic body 302, and can be adjusted in a direction to reduce the inductance value more accurately than in the second embodiment. it can.

At this time, a “U” -shaped magnetic body 302 made of ferrite or the like is provided outside the “U” -shaped print pattern 301, and the opening of the magnetic body 302 is formed by the opening of the print pattern 301. The same effect can be obtained even if they are arranged so as to be the same as the direction.

In the present embodiment, the print pattern and the shape of the magnetic material have been shown as a straight line or a U-shape. However, the same effect can be obtained with a circular or zigzag shape.

(Embodiment 4) FIG. 4 shows a case where a print pattern 401 having a U-shape and a plurality of magnetic bodies 402 to 404 having the same size are provided, and the magnetic bodies 402 to 404 are appropriately cut. A technique for adjusting the inductance of the print pattern 401 will be described. FIG. 4A shows a “U” -shaped print pattern 401 laid on a printed circuit board and a plurality of independent circles of ferrite or the like having the same size inside the opening of the print pattern 401. In which the magnetic members 402, 403, and 404 are arranged, and show a state before adjustment. FIG. 4B shows a state after the magnetic body 402 is cut by a drill or the like to form a substrate portion 405. The magnetic body 402 is cut and the inductance value of the print pattern 401 decreases. The magnetic body 402 can be easily cut with a drill or the like, and the inductance of the printed pattern 401 can be adjusted stepwise in a direction to reduce the inductance value depending on the number of magnetic bodies to be cut. This is effective when little precision is required. .

(Embodiment 5) FIG. 5 shows a print pattern 501 having a U-shape and a plurality of magnetic bodies 502 to 504 having different sizes.
The technique for adjusting the inductance of the print pattern 501 by cutting the print pattern 501 will be described. FIG. 5A shows a U-shaped print pattern 501 laid on a printed circuit board and a plurality of independent circles of different sizes made of ferrite or the like inside the opening of the print pattern 501. Magnetic bodies 502 to 504 are arranged, and show a state before adjustment. In FIG. 5B, the magnetic material 5 is used.
This shows the state after adjustment of the substrate portion 505 by cutting 02 with a drill or the like. The inductance value of the printed pattern 501 is reduced by cutting the magnetic material 502. The magnetic bodies 502 to 504 can be easily cut with a drill or the like,
The inductance of the printed pattern 501 can be adjusted stepwise in a direction to reduce the inductance value according to the size and the number of the magnetic bodies 502 to 504 to be cut. At this time, the adjustment can be made more stepwise as compared with the invention described in the fourth embodiment. The magnetic bodies 502 to 504
Are made logarithmic (for example, two with an area 1, one with an area 2, and one with an area 5), a more precise adjustment can be made by combining these.

In the following embodiment, the inductance element shown in the first embodiment is representatively shown, but this may be any of the inductance elements in the first to fifth embodiments.

FIG. 13 is a block diagram from the input to the mixer of a general BS tuner, which is the same as the conventional example. Therefore, description of FIG. 13 is omitted because it has been described in the related art.

(Embodiment 6) FIG. 6 shows an embodiment of the input filter circuit 1302 of FIG. 6, an input terminal 601 includes a capacitor 606, a printed pattern 609, and a capacitor 607.
And the printed pattern 610 and the capacitor 608 and the printed pattern 611 form a series resonance circuit. The coupling capacitors 602, 603, 604 and 605 connecting these series resonance circuits constitute a high-pass filter. A magnetic body 612, 613, and 614, which are opposed to any one or all of the print patterns 609, 610, and 611 in the vicinity and independently attached thereto, are provided.

The operation of the high-pass filter configured as described above will be described below. Capacitor 60
Even if there is a variation in the capacitance value from 6 to 608, or a variation in the inductance value from the printed patterns 609 to 611, any or all of the magnetic bodies 612 to 614 may be cut off. It is possible to precisely adjust the inductance of the printed pattern in the direction of reducing the inductance, and to optimize the high-pass filter.

FIG. 14 is a diagram similar to FIG.
6 shows the attenuation characteristics with respect to the frequency of the input filter circuit 1302 in FIG.
A dotted line and a solid line show before and after cutting and adjusting any or all of 13 and 614, respectively. In FIG. 14, the state after the adjustment is such that the loss in the receiving channels of CH1 to CH15, which are the input signals of the BS tuner, is minimized, and the attenuation is maximized so as to suppress the interference by the UHF input signal. Is the case. Thus, the characteristics can be made the same as the conventional example.

(Embodiment 7) FIG. 7 shows an embodiment of the interstage filter circuit 1304 of FIG. 7, a print pattern 708 and a capacitor 702, and a print pattern 709 and a capacitor 70
4. A parallel resonance circuit is formed by the printed pattern 710 and the capacitor 706, and these are connected in series, and both ends of the parallel resonance circuit are connected to the ground by capacitors 701, 703, 705, and 707, respectively, and a low-pass filter is formed. And The print pattern 70
A magnetic body 71 which is closely attached to any one or all of 8, 709, and 710 and is attached independently.
1, 712 and 713 are provided, respectively.

The operation of the low-pass filter configured as described above will be described below. Capacitor 70
2, 704, and 706, or the printed patterns 708, 709, and 710, even if there are variations in the inductance values.
Any one or all of the magnetic materials 1, 712, and 713 can be cut to reduce the inductance of the printed pattern with high precision, and the low-pass filter can be optimized.

(Embodiment 8) FIG. 8 shows a typical circuit diagram of the oscillation circuit 1306 of FIG. FIG.
In, the DC voltage applied to the power supply terminal 810 determines the base voltage of the oscillation transistor 812 by the resistors 807 and 809. Further, the emitter current is determined by the resistor 815. The transistor 8
The collector 12 is grounded at a high frequency by a capacitor 811. The emitter is grounded at a high frequency by a small-capacitance capacitor 814, a capacitor 813 for positive feedback is connected between the emitter and the base, and a Colpitts oscillation circuit of a common collector type is configured. Further, a capacitor 80 for coarse coupling is provided at the base of the transistor 812.
The printed pattern 801 is connected to the ground via the reference numeral 8. The printed pattern 801 is connected in parallel with a series-connected body in which a capacitor 803 is connected to the cathode side of a varicap diode 804. The tuning voltage applied to the tuning power supply terminal 806 is applied to the cathode of the varicap diode 804 via the resistor 805. The capacitance value of the varicap diode 804 is determined by the tuning voltage, and the oscillation frequency can be varied.

In the oscillation circuit having the above configuration, the inductance value of the printed pattern 801 that determines the oscillation frequency and the capacitance value of the transistor 812 via the capacitor 803, the varicap diode 804, and the capacitor 808 are determined. Even if there is a variation, it is possible to continuously and accurately adjust the direction in which the inductance of the print pattern is reduced by cutting a part of the magnetic body 802 which is independently attached to the vicinity of the print pattern 801 so as to face the vicinity thereof, A stable oscillation circuit can be provided by optimizing the tuning voltage.

As described above, in all the embodiments,
In order to cut these magnetic materials, there are a processing method using a laser and a processing method using a drill. Also, when the automatic adjustment is performed, since the print pattern and the magnetic material are arranged on the same plane, the pattern recognition before the adjustment and the inspection after the adjustment can be easily performed.

[0048]

As described above, according to the present invention, there is provided a printed pattern laid on the same plane of a printed circuit board, and a magnetic substance independently attached near the printed pattern. A part of the body is cut so that the inductance of the printed pattern can be adjusted in a direction to reduce the inductance of the printed pattern. And a high-frequency circuit having excellent performance can be provided.

According to the present invention, there is provided an inductance element capable of adjusting the inductance without increasing the thickness.
It is also suitable for future thinning of high frequency units.

[Brief description of the drawings]

FIG. 1A is a plan view before adjustment of an inductance element according to a first embodiment of the present invention; FIG. 1B is a plan view after adjustment;

FIG. 2A is a plan view before adjustment of an inductance element according to a second embodiment of the present invention, and FIG. 2B is a plan view after adjustment.

FIG. 3A is a plan view before adjustment of an inductance element according to a third embodiment of the present invention, and FIG. 3B is a plan view after adjustment.

FIG. 4A is a plan view before adjustment of an inductance element according to a fourth embodiment of the present invention, and FIG. 4B is a plan view after adjustment.

FIG. 5A is a plan view before adjustment of an inductance element according to a fifth embodiment of the present invention, and FIG. 5B is a plan view after adjustment.

FIG. 6 is a circuit diagram of an electronic circuit constituting an input filter of a BS tuner according to a sixth embodiment of the present invention.

FIG. 7 is a circuit diagram of an electronic circuit forming an interstage filter of a BS tuner according to a seventh embodiment of the present invention.

FIG. 8 is a circuit diagram of an electronic circuit forming an oscillation circuit of a BS tuner according to an eighth embodiment of the present invention.

9A is a plan view before adjustment of a conventional inductance element, and FIG. 9B is a plan view after adjustment.

FIG. 10 is a circuit diagram of an electronic circuit constituting an input filter of a BS tuner according to a conventional example.

FIG. 11 is a circuit diagram of an electronic circuit forming an interstage filter.

FIG. 12 is a circuit diagram of an electronic circuit constituting the oscillation circuit.

FIG. 13 is a block diagram from the input to the mixer of the BS tuner.

FIG. 14 is an attenuation characteristic diagram with respect to frequency before and after adjustment of an input filter of a BS tuner.

FIG. 15 is a perspective view showing the shape of a print pattern of an actual microstrip line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Print pattern 102 Magnetic body 103 Part of magnetic body

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI // H01R 17/12 H01R 17/12 A

Claims (11)

[Claims] 1. A printed pattern laid on a surface of a printed circuit board, and a magnetic body provided near the printed pattern, wherein the printed pattern and the magnetic body are independently formed on the same plane. And an inductance element that reduces the inductance of the printed pattern by sequentially removing the magnetic material. 2. The inductance element according to claim 1, wherein the print pattern is formed by a microstrip line. 3. The inductance element according to claim 1, wherein the printed pattern is provided in a U-shape and a magnetic material is provided over the entire opening of the printed pattern. 4. The inductance according to claim 1, wherein the printed pattern is provided in a U-shape and a magnetic material is provided in at least one of the inside and outside of the printed pattern in parallel with the printed pattern. element. 5. The inductance element according to claim 1, wherein a plurality of magnetic bodies having substantially the same shape are discretely arranged. 6. The inductance element according to claim 1, wherein a plurality of magnetic bodies having an area ratio substantially logarithmically arranged are discretely arranged. 7. In a series connection of a capacitor and an inductance element, the inductance element is connected to the capacitor.
An electronic circuit comprising the inductance element according to claim 6. 8. A plurality of series-connected bodies of a capacitor and an inductance element are provided between an input terminal and an output terminal, wherein the inductance element is the inductance element according to any one of claims 1 to 6. And an electronic circuit in which one end of the series connection body is connected to the ground and the other ends are connected in series via a connection capacitor. 9. A parallel connection body of a capacitor and an inductance element, wherein the inductance element is connected to the capacitor.
An electronic circuit comprising the inductance element according to claim 6. 10. The inductance element according to claim 1, wherein a plurality of parallel connected bodies of a capacitor and an inductance element are provided in series between an input terminal and an output terminal, and wherein the inductance element is an inductance element according to claim 1. And an electronic circuit in which capacitors are respectively connected between both ends of the parallel connection body and ground. 11. An electronic circuit comprising an oscillation circuit including a resonance circuit in which a capacitor and an inductance element are connected in parallel, wherein the inductance element is the inductance element according to any one of claims 1 to 6.